Revert of Changed CSSParserContext argument from * to & for null safety.

third_party/WebKit/Source/core/css/properties/CSSPropertyAPIStrokeDasharray.cpp

 // Copyright 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/properties/CSSPropertyAPIStrokeDasharray.h"
 
 #include "core/css/CSSValueList.h"
 #include "core/css/parser/CSSPropertyParserHelpers.h"
 
 namespace blink {
 
 const CSSValue* CSSPropertyAPIStrokeDasharray::parseSingleValue(
     CSSParserTokenRange& range,
-    const CSSParserContext& context) {
+    const CSSParserContext* context) {
   CSSValueID id = range.peek().id();
   if (id == CSSValueNone)
     return CSSPropertyParserHelpers::consumeIdent(range);
 
   CSSValueList* dashes = CSSValueList::createCommaSeparated();
   do {
     CSSPrimitiveValue* dash = CSSPropertyParserHelpers::consumeLengthOrPercent(
         range, SVGAttributeMode, ValueRangeNonNegative);
     if (!dash ||
         (CSSPropertyParserHelpers::consumeCommaIncludingWhitespace(range) &&
          range.atEnd()))
       return nullptr;
     dashes->append(*dash);
   } while (!range.atEnd());
   return dashes;
 }
 
 }  // namespace blink